I am 1337 h4x0r, and this looks real to me. Microchips in Jab!
(files.catbox.moe)
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The newer UHF toll tags are around 915MHz, but antennas printed on plastic is still pretty big -- they need to be to get enough power to run the chip. I have found a couple of useful links:
https://en.wikipedia.org/wiki/EZ_TAG
https://transcore.com/literature
Plenty of literature there. Without a battery, there is just not enough power for any kind of processing. The communications protocol has a bit of smarts for separating multiple chips responding to a transponder. It's just for ID purposes. Programming flash will takes lots and lots of power (milliwatts), so the ID is fixed at the time it is affixed.